honojs node-server up to 2.1.5 WebSocket Upgrade upgradeWebSocket cross-site request forgery

Summaryinfo

A vulnerability, which was classified as problematic, has been found in honojs node-server up to 2.1.5. This vulnerability affects the function upgradeWebSocket of the component WebSocket Upgrade. This manipulation causes cross-site request forgery. The identification of this vulnerability is CVE-2026-126344. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in honojs node-server up to 2.1.5 and classified as problematic. Affected by this vulnerability is the function upgradeWebSocket of the component WebSocket Upgrade. The manipulation with an unknown input leads to a cross-site request forgery vulnerability. The CWE definition for the vulnerability is CWE-352. The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. As an impact it is known to affect integrity. The summary by CVE is:

@hono/node-server allows running the Hono application on Node.js. From 2.0.0 until 2.1.6, the WebSocket upgrade path resolves a raw request-target beginning with // against a base URL built from the Host header, causing the WHATWG URL parser to treat the request-target as a network-path reference and replace the host in c.req.url. Routing still uses the local WebSocket path, so an application that compares the Origin header with the origin of c.req.url, including checks implemented with csrf(), compares an attacker's origin with itself and accepts the connection. A page on another site can consequently open a WebSocket with the victim's cookies and read and send messages when the application uses upgradeWebSocket and trusts the host in c.req.url. Ordinary HTTP requests are not affected. This issue is fixed in version 2.1.6.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-126344 since 11/10/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 2.1.6 eliminates this vulnerability.

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Productinfo

Vendor

• honojs

Name

• node-server

Version

• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5

Website

• Product: https://github.com/honojs/node-server/

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